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machgnr 01-02-2005 10:02 AM

Holley Dominator flange pattern
1 Attachment(s)
Hi all,

I've browsed a few times but never posted on one of these. I've got a '64 Chevelle with a 406 that's street legal and runs 11.02's on MT street ET's. I've just bought a Hampton 6-71 and want to put a Holley 4500 Dominator 1150 or 1250 on top instead of two smaller carbs. I also have a complete hilborn injection hat and scoop but wanted to keep it somewhat streetable. I've got a full machine shop with CNC mill and lathe to work with to build an adapter plate.... I need the base plate (holes and bolt pattern) dimensions or maybe a full sized scan of a dominator gasket so I can make a hat for the one carb. I can't find the info anywhere on the net and no one around here has anything that big. Any help would be greatly appreciated. I can give direct email addy to send the print or scanned file if someone can do this for me. As soon as I figure out how to get a picture of my car under my handle I'll do so. Thanks

benwantland 01-02-2005 11:37 AM

That's a beautiful car. I can't help you directly, but eventually, you'll have to buy a Dominator gasket to mount the carb; why not just pick one up now? Even if they're not in stock, almost any auto parts store should be able to order one for you. I know every chain here in Iowa can get Holley stuff.

machgnr 01-02-2005 12:10 PM

gasket idea
Thanks ben,

I guess I should have been a bit more specific, my goof. I tend to be a bit impatient, maybe some of you can understand that one!. There is a speed shop downtown that may have a gasket but their not open until Tuesday. If I can get the info today or tomorrow I can do it when I go to work on afternoon shift. Helps kill the time if things get slow at work! Thanks for help though.

Max Keith 01-02-2005 12:16 PM

gasket for pattern
Yep, here in Iowa, we can get all that stuff at local parts stores, course may have to wait a day or two to get it.

Failing all else, on your template for your adaptor, how about turning the carb upside down, and using paper, trace out the ports and flange pattern onto it, with the old rub the pencil lead over all the edges routine, then do the same with your intake base? and superimpose the two onto one another?

Once you have your basic outlines, you can then clean up the rough edges of your tracings and can transfer them to a stiffer medium like cereal box carboard, for your template.

I know thats old school tech but it still works pretty well.

machgnr 01-02-2005 12:48 PM

tracing the baseplate
OK guys, like I said....I haven't posted on these before and now I'm feeling a bit dumb. ha ha I'm assuming everyone knows what I take for granted. Stupid I know..I don't have the big Holley yet..still looking for one so can't trace the bottom just yet. Just wanted to get building on the adapter plate. I guess also while I'm on that one..if anyone has a nice gas 1150 or 1250 dominator that they want to trade for a like new Hilborn four hole injection with polished scoop and metering block assembled. lets talk! thanks again for the help guys. headin out to work now.

Max Keith 01-02-2005 12:51 PM

Hilborn setup
You might want to post that in the parts for sale section. Make it a sale or trade option.

Full Throttle 01-02-2005 04:20 PM

I have always heard the dominator wasn't a good choice for a street car. Why dont you want 2 carbs.

machgnr 01-02-2005 08:59 PM

dominator vs two carbs
I just thought two carbs would be harder to maintain, linkage, tune, etc. I was thinking of being able to step up a big dominator to the same flow or maybe a bit more than two smaller carbs without the hassles of multiples. I did find alsblowers and they have the bid daddy garlits carb covers with a note that says they're coming out with a single dominator carb cover for blowers. I guess the idea isn't so far off if he's playing in it.

Full Throttle 01-02-2005 09:44 PM

I have the enderle linkage on mine which was fairly easy to hook up. It is very adjustable with splined shafts so it doesn't slip. I have 2 ea 850dp on mine which I sent to Rupert racing to build. He is very good with the holleys and nailed my setup the first time. When you have two carbs you build them with smaller idle circuit flow per carb because you are idling with 2 carbs now. He already has a big knowledge base on peoples setups and can probably get your right the first time also. I just sent mine back to him to refresh them since I'm putting this motor back in my car. He saved the build sheet on mine from about 5 years back. I even put the idle screws right back to the same position he had them in after I tried to adjust them. It idled great and ran a 6.30 in the 1/8th.

machgnr 01-03-2005 12:34 AM

two 850 dp's ?
OK maybe I'm thinking too small. I've got a 406 with AFR stage 2 heads and will swap to a blower cam, unsure of which cam though. What cfm should I be looking for to feed a 6-71 on a 406? It's actually a street car that's went to the track and quickly evolving into a strip machine that's gonna be driven on the street too, if you know what I mean !! I've only got an 8 gallon fuel cell in the trunk so akly's out! ha. Should I be looking for a couple of 650's or 750's? I seen an ad somewhere today a guy had two 750's dyno'd for a blower and never used. He was going to something bigger. opinion? also some blower cam advise as well would be appreciated. I'm also calling Hilborn tomorrow (Monday) to ask about a pump, bypasses, etc to set up the injection. I'll weigh that cost to the carb route and see what that looks like.

Full Throttle 01-03-2005 07:04 AM

I run the 850's because blower drive service recommended them for a 460bbc. I would talk to hampton or bds and get the recommended carb size but I figure two 750's or 800's. If you are buying the carbs new I would suggest you talk to rupert racing. The prices are pretty good and you wont have to spend all that time chasing the tune up. Thats worth a lot by the time you get some used carbs from somone and foul no telling how many plugs and go thru bowl gaskets and a lot of time. I'm pretty cheap and like to do things myself but I dont plan on ever trying to guess on the blower tune up again. On the cam I started with the bds recommendation's. I pasted these from their site.
(The lobe center of the cam will play an important role in determining the performance characteristics of an engine. Wide lobe centers (112 to 114 degrees etc.) will create higher cylinder pressure providing more horsepower with cooler burning fuel such as alcohol and methanol. We have found 110 lobe centers to produce the best overall power on gasoline.
Whatever cam you choose, make sure that it will operate and perform properly in the RPM range required for your application.)
I will also paste the link to the bds recommendation page.

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